What to do, how to cancel it and to be sure that it will not be lost ETH?
Just ask him to rebroadcast the ethereum transaction with same nonce and increased gas fee than actual recommended fee than now. your ETH is not lost it just need the boost on gas fee.I will do that, just waiting for a lower gas price.
Other than this, you can't do anything since the transaction isn't coming from your end. Only the sender can cancel/modify the transaction.
The cost of gas has recently fluctuated over the trading situation itself. Even if you set the gas to high, the gas can increase by 4x in a few minutes.
I think that's exactly what happened. It took too long for him to finalize the transaction.
I also experienced the same thing with you and tried to cancel my transaction via metamask which was also delayed due to setting the gas too low. I followed this method https://info.etherscan.com/how-to-cancel-ethereum-pending-transactions/#replacing-cancel-pending-transactions
when you did a transaction cancellation? I see it's still pending.
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I also experienced the same thing but I am the one sending it. I cancel the transaction by sending 0 ETH to the same address I am using with the acceptable transaction fee. Once the transaction confirmed, the pending transaction was canceled. But I think your case is different since you are on the receiving end.
